This is for people that use an airspy or want a lot more power than an RPI3B+.
about 2-7 times more powerful than an RPI3. 2-3 times the price.
Better and more memory (1320Mhz ddr4 - 2 or 4GB). RPI has 1GB lpddr2
6 cores (well 2 low power and 4 high power)
Full 1Gb/s ethernet
USB 3.0 (~ 10 times faster than the RPI3)
eMMC memory (optional) much faster than an SD card
massive passive heatsink (so no noise)
better GPU(don’t use it so no idea about the difference)
Their performance stats (so should be taken with a grain of salt)